Interesting. Have you run any numbers on cost? What would you charge, and for how much space? The only real problem I see is the problems of theft and what the renters would expect of the community. A minor problem might be rules for use of pesticides.
The cost verses return does bother me. I know one guy who does it and he charges $40 for a 10x10 plot. Without running numbers that seems like a break even at best.